From 06cf175b084c5c12e79a64375a5d6695bbdd8322 Mon Sep 17 00:00:00 2001
From: Dan Brown <ssddanbrown@googlemail.com>
Date: Thu, 7 Dec 2017 19:27:54 +0000
Subject: [PATCH] Prevented page navigation highlighting erroring

This was when no page nav was on the page
---
 resources/assets/js/pages/page-show.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/resources/assets/js/pages/page-show.js b/resources/assets/js/pages/page-show.js
index 8c2f0e300..6af5af57d 100644
--- a/resources/assets/js/pages/page-show.js
+++ b/resources/assets/js/pages/page-show.js
@@ -170,7 +170,7 @@ let setupPageShow = window.setupPageShow = function (pageId) {
       // fetch all the headings.
       let headings = document.querySelector('.page-content').querySelectorAll('h1, h2, h3, h4, h5, h6');
       // if headings are present, add observers.
-      if (headings.length > 0) {
+      if (headings.length > 0 && pageNav !== null) {
           addNavObserver(headings);
       }